Mr Mount said Princess Diana was “the first young royal to try to control the news agenda in 1995”, with her controversial BBC Panorama interview with journalist Martin Bashir.
He suggests Meghan is following down the same path, by suing Associated Newspapers, the publishers of the Daily Mail, Mail on Sunday and Mail Online, for publishing private letters sent to her father, Thomas Markle.
She is seeking damages from the publisher for alleged misuse of private information, copyright infringement and breach of the Data Protection Act.
Associated Newspapers wholly denies the allegations, particularly the Duchess’s claim the letter was edited in any way that changed its meaning, and says it will hotly contest the case.
Meghan Markle is following in the footsteps of Princess Diana and failing to “put up and shut up”
Princess Diana was “the first young royal to try to control the news agenda in 1995”, Mr Mount has claimed
The commentator, suggested Meghan won’t be the one who benefits from the case.
He said: “The only people who benefit when royals take matters into their own hands are the lawyers.”
Mr Mount, who previously worked as a lawyer, then drew parallels between the two female royals.
Writing in the Daily Telegraph, he said: “The Martin Bashir story and the Duchess of Sussex’s lawsuit highlight the challenges of those who marry into the Firm, particularly independent-minded young women.
“As Diana found to her cost, and the Duchess of Sussex is beginning to find, once you’re in the spotlight, you try to manipulate things to your advantage at your peril.”
Mr Mount said while the outcome of Meghan’s lawsuit is yet to be decided, the consequences for Diana were severe, with the Queen hastening her and Prince Charles’ divorce proceedings.
He then proceeded to give advice to the Royal Family and implied this was not the path Diana or Meghan went down.
The author said: “The lesson of all those who would wish to succeed in the Royal Family is that once you’re in, you should put up and shut up, like the Queen and the Duchess of Cambridge have done.
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Princess Diana gave an interview to BBC’s Martin Bashir in 1995
“The Queen never gives interviews and never goes to law.
“The Duchess of Cambridge is learning to emulate her.”
Mr Mount added: “It is better to be a cypher – i.e. do nothing – than go to law or give interviews to the BBC or ITV.”
In a final warning to members of the Royal Family, he shared a quote by Victorian constitutional writer Walter Bagehot, which reads: “[Royalty’s] mystery is its life.
Royal Family on social media
“We must not let in daylight upon magic.”
Commenting on the phrase, Mr Mount said: “Royalty shouldn’t let in TV limelight upon that magic, either, or the law’s lethal, overpriced gaze.”